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Search: id:A081404
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| 0, 2, 4, 5, 7, 7, 16, 11, 13, 11, 10, 13, 13, 12, 25, 17, 31, 12, 16, 14, 17, 18, 43, 19, 35, 29, 22, 55, 31, 23, 18, 20, 25, 28, 41, 30, 20, 83, 85, 47, 91, 18, 26, 67, 53, 22, 17, 42, 115, 26, 37, 26, 24, 127, 256, 133, 71, 34, 30, 20, 52, 77, 28, 38, 24, 83, 21, 26, 175, 36
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OFFSET
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1,2
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EXAMPLE
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a(1)=0 since 1 has no prime factor; a(100)=A008475(541-1)=A008475(4.27.5)=4+27+5=36
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MATHEMATICA
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ffi[x_] := Flatten[FactorInteger[x]] lf[x_] := Length[FactorInteger[x]] ba[x_] := Table[Part[ffi[x], 2*w-1], {w, 1, lf[x]}] ep[x_] := Table[Part[ffi[x], 2*w], {w, 1, lf[x]}] supo[x_] := Apply[Plus, ba[x]^ep[x]] Table[supo[w], {w, 1, 25}]
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CROSSREFS
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Cf. A008475, A000142, A081402, A081403.
Sequence in context: A085888 A112233 A062249 this_sequence A081516 A023962 A094562
Adjacent sequences: A081401 A081402 A081403 this_sequence A081405 A081406 A081407
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Mar 31 2003
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